Water tube boiler



Jan. 19, 1932. .J. A. BARNES WATER TUBE BOILER Filed June 21, 1929 2Sheets-Sheet l INVENTOR ATTORNEY Jan. 19, 1932. J. A. BARNES WATER TUBEBOILER Filed June 21, 1929 2 Sheets-Sheet 2 INVENTOR JOHN I). BflRNfSATTORNEY Patented Jan. 19, 1932 UNITED STATES PATENT OFFICE JOHN A.BARNES, OF CHAPPAQUA, NEW YORK, ASSIGNOR TO THE SUPERHEATER COM- PANY,OF NEW YORK, N. Y.

WATER TUBE BOILER Application filed June 21,

My invention relates to water tube boilers and has particular referenceto Yarrow or A type boilers, although it may be applied to other formsof steam generators.

A principal object of the invention is to provide a. boiler having afurnace water wall formed of integral tubes, portions of which form apart of the heating surface of the boiler proper. A more specificpurpose of H the invention is to provide an improved form of water wallconstruction for the boiler furnace in which use is preferably made ofthe bifurcated type of tube disclosed in U. S. Patent #1,676,245 grantedto Carl A. Brandt on the th day of July, 1928. and in which the numberof joints required to form the desired structure is reduced to aminimum. A still further purpose of the invention is to provide a waterwall construction of the character described in which the water walltubes are extended beyond the confines of the boiler furnace to form asubstantially solid water cooled battle for directing the furnace gasesover the tube bank or banks of the boiler.

' The invention further consists in the novel arrangement of elementsand particulars of design which may best be understood from the ensuingdescription of preferred embodiments of the invention illustrated'in theaccompanying drawings in which Fig. 1 is a transverse section through aYarrow boiler embodying the invention; Fig. 2 is a fragmentary centrallongitudinal section of the boiler shown in Fig. 1; Fig. 3 is afragmentary section taken on the line 33 of F1g.

2; Figs. 4 and 5 are respectively fragmentary transverse andlongitudinal sections showing a modified form of the invention; Figs. 6and 4 are views s1m1lar to Figs. at and a of still another modification;Fig. 8 is a fragmentary section on an enlarged scale taken on the line8-8 of Fig. t; Figs. 9 and 10 are views similar to Figs. 6 and 7 ofanother modification of the invention. and Figs. 11 and 12 are viewssimilar to Figs. 9 and 10 of still another modification. Referring nowto Fig. 1 the boiler illustrated is of the Yarrow type comprising anupper steam and water drum 1 and a pair of spaced lower water drums 2and 3, the latter being connected re- 1929. Serial No. 372,615.

to drum 1 by the tube banks 4 of the tube banks 4 and 5 there is locateda. row of bifurcated tubes 6 and 7, each of said tubes being bifurcatedat point 8 between the upper and lower drums.

As will be seen more clearly from Fig. 2, the tubes 6 and 7 comprisessingle upper portions 6a above bifurcations 8, these portions beingpreferably spaced substantiallv the same distance apart as thelongitudinal spacing of the tubes in banks 4 and 5. so that the portions6a: of the bifurcated tubes form in effect the front row of water tubesof the tube banks. Below the bifurcations the dual lower portions 67)extend downwardly in substantially contacting relation to forin battles9 in front of the lower portions of the tube banks. As will be notedfrom Fig. 1 the tube portions (in and 67) above the level of the lowerdrums are substantially parallel to the tubes of the tube banks. Belowthe lower drums. the portions 66 of the tubes are preferablv bent toextend vertically downward to form substantially solid side walls forthe furnace 10. At their lower ends. the portions 67 are preferably bentoutwardly and ioined by a second series of bifurcations 11. therebvproviding single lower end portions 12 which are connected into headers13 which lie parallel. to and below the lower boiler drums. Headers 13are in turn connected with the boiler. preferably by means of risers 14entering the lower boiler drums. Battles 15 are provided to direct thefurnace gases over the tubes in the manner shown by the arrows in Fig.1.

In the form of construction shown in Fig. 4. the arrangement isessentially the same as that already described, the only differencebeing that the bifurcations 8a are located substantially at the level ofthe lower boiler drums so that the gas pass provided between the uppersingle portions of the bifurcated tubes extends the full distance fromthe upper to the lower drum. This construction is utilized where it isdesired to have a single pass boiler with the products of combustionpassing directly through the tube banks in a substantially undeflectedpath.

In the modification shown in Fig.6 the bifurcations 8b are placedadjacent the upper drum and the same gas path shown in Fig. at isobtained by arranging the bifurcations 8?) at an angle with respect tothe longitudinal axis of the boiler so that the portions of the tubeslying between the bifurcations and the lower drum are arranged in alongitudinally staggered row. Below the level of the drum, the lowerportions of the tubes are bent into a single plane as shown in 6, toform a substantiallv solid furnace water wall and are joined by secondbifurcations and connected into the boiler preferably in the manneralready described.

A slight variation of the form shown in Fig. 6 is shown in Figs. 9 and10. the same general arrangement of the front row of tubes with respectto spacing and gas flow being obtained by bending one of the lower tubeportions of each of the bifurcated tubes out of line with the other in aplane transverse to the boiler axis to form a staggered tube row. Belowthe level of the lower boiler drum. the lower portions of the bifurcatedtubes are again bent into a single plane to form the furnace water wall.

In the form shown in Figs. 11 and 12. the front tube rows are formed ofsingle tubes which are rolled into the upper drum in staffgered relationand extend downwardlv therefrom parallel to each other to form astaggered tube row extending substantially to the level of the lowerdrum. at which point they are bent into a cotnmon plane extendingdownwardly to foim a solid water wall for the furnace. In order toutilize the minimum s ze of headers to which the lower ends of thesetubes are connected. and at the same time to provide the necessaryligament strength in the header. alternating tubes are bent out of lineadjacent to the lower header so that the tubes enter the header instaggered relation in the same manner as they are secured to the upperdrum.

It will be obvious that the several embodiments herein described may beconsiderably modified without departing from the spirit of theinvention. For example. the bifurcated tubes shown may be modified toprovide a single upper portion integrally connected to more than twolower portions. and it is to be understood that the term bifurcated isintended to cover such modified forms of construction. It will furtherbe obvious that other arrangements of the tubes forming the water wallsand front rows of the tube banks may be employed without departing fromthe invention which is to be considered as limited only by the scope ofthe appended claims.

I claim:

1. A boiler comprising a steam and water drum, a water drum, abank ofinclined tubes connecting said drums, a row of tubes enerally parallelto and in front of said tube ank, said last named tubes being connectedat their upper ends to the steam and water drum and extending andclosely spaced below the water drum to form a substantially solidfurnace wall and relatively widely spaced above the level of the waterdrum to permit combustion gases to pass therebetween, and means forsupplying water from the boiler to the lower ends of said tubes.

2. The combination according to claim 1 in which the front row tubes areclosely spaced for a substantial distance above the lower drums to forma bafile in front of the lower portion of the boiler tube bank.

3. A boiler comprising an upper steam and water drum, spaced lower waterdrums, banks of vertically inclined water tubes connecting the steam andwater drum with each of the water drums, a'row of water tubes extendingfrom the upper drum in front of each of said banks of tubes andgenerally parallel therewith to a point substantially below the tops ofthe lower drums, the tubes of said rows being closely spaced below thelevel of the lower drums to form substantially solid furnace waterwalls, and means for supplying water from the boiler to the lower endsof said tubes.

4. A boiler comprising a steam and water drum, a water drum, a bank ofinclined tubes connecting said drums, a row of bifurcated tubes disposedgenerally parallel to and infront of said bank, the single portions ofsaid tubes above the bifurcations being connected with the steam andwater drum and the dual portions below the bifurcations extending belowthe level of the water drum in closely spaced relation to form asubstantially solid furnace water wall, and means for supplying water.from the boiler to the lower ends of said bifurcated tubes.

5. A boiler comprising a steam and water drum a water drum, a bank ofinclined tubes connecting said drums, a row of bifurcated tubes disposedgenerally parallel to and in front of said bank, each of said tubesbeing bifurcated at a point intermediate said drums. the single portionsof the tubes above the bifurcations being connected to the steam andwater drum and spaced to permit com-- bust-ion gases to passtherebetween, and the portions below the bifurcations extending inclosely spaced relation below the level of the water drum to form asubstantially solid furnace water wall and a bafile in front of thelower portion of said tube bank, and means for supplying water from theboiler to the lower ends of said bifurcated tubes.

6. A boiler comprising an upper steam and water drum. a pair of spacedlower water drums. a bank of inclined water tubes connecting the upperdrum with each of the lower drums, a header generally parallel to andbelow each of the lower drums, a row of water tubes generally parallelto and in front of each of said tube banks, each of said rows connectingthe upper drum with one of said headers and comprising tubes havingsingle relatively widely spaced end portions and relatively closelyspaced bifurcated intermediate portions forming a substantially solidwater wall extending both above and below the level of the lower drums,and means connecting each of said headers with the lower portion of theboiler.

T. A boiler comprising an upper steam and water drum, a lower waterdrum, a bank of inclined water tubes connecting said drums, arow oftubes generally parallel to and in front of said bank, each of the tubesof the front rows being bifurcated substantially at the level of thelower drum and comprising a single portion extending upwardly from thebifurcation to connect with the upper drum and substantially contactingdual por tions'extending downwardly from the bifurcation to form furnacewalls, the spacing of the said front row tubes being such thatsubstantially solid water walls are formed be low the water drums, andmeans connecting the lower ends of said front row tubes with the lowerportion of the boiler.

8. A boiler comprising an upper steam and water drum, a lower waterdrum, a bank of inclined water tubes connecting said drums, a row oftubes generally parallel to and in front ofsaid bank, each of the tubesof the front rows being bifurcated adjacent to the upper drum andcomprising a single portion extending upwardly from the bifurcation toconnect with the upper drum and dual portions extending downwardly fromthe bifurcation to a point below the level of the lower drum, the partsof said lower portions between the bifurcations and the lower drum beingspaced and arranged in staggered relation, and the parts of the lowerportions below the lower drum being bent into a single plane insubstantially contacting relation to form a substantially solid furnacewater wall, and means connecting the lower ends of said front row tubeswith the lower portion of the boiler.

9. A boiler comprising an upper steam and water drum, a lower waterdrum, a bank of inclined water tubes connecting said drums, a headerparallel to and below the lower drum a plurality of tubes connecting theupper drum and said header, the portions of said tubes above the lowerdrum being arranged in spaced staggered relation generally parallel toand in front of said bank and the portions of said tubes below the lowerdrum being arranged in substantially contacting relation in a singleplane to form a substantially solid furnace water wall, and

means connecting said header with the lower portion of the boiler.

10. A boiler comprising means for enclosing steam and water, a waterdrum, a bank of tubes connecting said water drum with the space withinsaid means, a row of tubes generally parallel to and in front of saidbank, said last named tubes being connected at their upper ends with thespace within said means and closely spaced below said water drum to forma substantially solid furnace wall and relatively widely spaced abovethe level of the water drum to permit combustion gases to passtherebetween, and means for supplying water from the water space of theboiler to the lower ends of said tubes.

11. boiler comprising means for enclosing steam and water, a water drum,a bank of tubes connecting said drum and the space within said means, arow of bifurcated tubes disposed generally parallel to and in front ofsaid bank, the single portions of said tubes above the bifurcationsbeing connected with the space within said means and the dual portionsbelow the bifurcations extending below the level of the water drum inclosely spaced relation to form a substantially solid furnace waterwall, and means for supplying water from the boiler to the lower ends ofsaid bifurcated tubes.

12. A boiler having means for enclosing steam and water, a water drum, abank of tubes connecting the space within said means with said drum, arow of bifurcated tubes disposed generally parallel to and in front ofsaid bank, each of said tubes being bifurcated at a point intermediatesaid drum and said means, the single portions of the tubes above thebifurcations being connected to the steam and water space within saidmeans and arranged to permit combustion gases to pass therebetween, andportions below the bifurcations extending in closely spaced relationbelow the level of the water drum to form a substantially solid furnacewater wall and a bathe in front of the lower portion of said bank, andmeans for supplying water from the water space of the boiler to thelower ends of said bifurcated tubes.

JOHN A. BARNES.

